well, my goodness, I am so sorry to have missed this!
The usual rate of transmission from females to males having sex about twice per week without condoms and without antiviral therapy taken daily is 4% per year – that is, 4 men would be infected in this situation. With daily antiviral therapy, the rate is about 2% per year.
Transmission occurs most often in the first six months of relationship because people are usually having a lot more sex then for longer period of time and thus the vulnerable people are often not in studies because they are already infected. Does that make sense?
You’ve got another question left.
Terri